EP3591597A1 - Article transport facility and article transport method - Google Patents

Article transport facility and article transport method Download PDF

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Publication number
EP3591597A1
EP3591597A1 EP19183149.4A EP19183149A EP3591597A1 EP 3591597 A1 EP3591597 A1 EP 3591597A1 EP 19183149 A EP19183149 A EP 19183149A EP 3591597 A1 EP3591597 A1 EP 3591597A1
Authority
EP
European Patent Office
Prior art keywords
transport
warehouse
articles
automatic warehouse
target
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19183149.4A
Other languages
German (de)
English (en)
French (fr)
Inventor
Nobuhiko Sato
Hirokazu OOYAMA
Mamoru OKUHARA
Yuya FUKUWA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daifuku Co Ltd
Original Assignee
Daifuku Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daifuku Co Ltd filed Critical Daifuku Co Ltd
Publication of EP3591597A1 publication Critical patent/EP3591597A1/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/08—Logistics, e.g. warehousing, loading or distribution; Inventory or stock management
    • G06Q10/087—Inventory or stock management, e.g. order filling, procurement or balancing against orders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G1/00—Storing articles, individually or in orderly arrangement, in warehouses or magazines
    • B65G1/02—Storage devices
    • B65G1/04—Storage devices mechanical
    • B65G1/137—Storage devices mechanical with arrangements or automatic control means for selecting which articles are to be removed
    • B65G1/1373—Storage devices mechanical with arrangements or automatic control means for selecting which articles are to be removed for fulfilling orders in warehouses
    • B65G1/1375—Storage devices mechanical with arrangements or automatic control means for selecting which articles are to be removed for fulfilling orders in warehouses the orders being assembled on a commissioning stacker-crane or truck
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G1/00—Storing articles, individually or in orderly arrangement, in warehouses or magazines
    • B65G1/02—Storage devices
    • B65G1/04—Storage devices mechanical
    • B65G1/137—Storage devices mechanical with arrangements or automatic control means for selecting which articles are to be removed
    • B65G1/1373—Storage devices mechanical with arrangements or automatic control means for selecting which articles are to be removed for fulfilling orders in warehouses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G1/00—Storing articles, individually or in orderly arrangement, in warehouses or magazines
    • B65G1/02—Storage devices
    • B65G1/04—Storage devices mechanical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G63/00—Transferring or trans-shipping at storage areas, railway yards or harbours or in opening mining cuts; Marshalling yard installations
    • B65G63/002—Transferring or trans-shipping at storage areas, railway yards or harbours or in opening mining cuts; Marshalling yard installations for articles

Definitions

  • the present invention relates to an article transport facility including a plurality of automatic warehouses that store articles, and a retrieval transport device that transports, to a transport target location, the articles retrieved from the plurality of automatic warehouses, and an article transport method for transporting articles in such an article transport facility.
  • JP 2018 - 12 586 A An example of the article transport facility as described above is disclosed in JP 2018 - 12 586 A .
  • the article transport facility of JP 2018 - 12 586 A includes, as shown in FIG. 1 of the JP 2018 - 12 586 A , a storage (1) that includes a plurality of article storage racks, and conveyors (an upstream transport conveyor (C10) and a delivery conveyor (C30)) that transport articles (B) retrieved from the storage (1) to an end portion (Ce) at which a picking operation is performed.
  • a storage (1) that includes a plurality of article storage racks
  • conveyors an upstream transport conveyor (C10) and a delivery conveyor (C30)
  • an article rearrangement device for changing the transport order of the articles (B) is provided at a connection portion between the upstream transport conveyor (C10) and the delivery conveyor (C30), thus enabling the articles (B) to be transported to the end portion (Ce) in an order that is specified (specified order), regardless of the order in which the articles (B) are retrieved from the storage (1).
  • the efficiency of retrieval from the storage (1) can be improved by the ability to retrieve the articles (B) from the storage (1) without consideration given to the specified order.
  • the article transport facility of JP 2018 - 12 586 A is configured, as shown in FIG. 2 in the JP 2018 - 12 586 A , such that any article that is retrieved from the automatic warehouses and transported to the transport target location (i.e., also a group of articles whose order of retrieval from the automatic warehouse matches the specified order) is transported out into the article rearrangement device and is temporarily accumulated in the device before being transported toward the transport target location. Accordingly, although the article transport facility of JP 2018 - 12 586 A can improve the efficiency of retrieval from the automatic warehouses by providing the article rearrangement device, the cost of the facility and the installation space may increase in order to satisfy the accumulation capability and the transport-in/out capability required for the article rearrangement device.
  • An article transport facility includes a plurality of automatic warehouses that store articles, a retrieval transport device that transports, to a transport target location, the articles retrieved from the plurality of automatic warehouses, an inter-warehouse transport device that transports the articles between the plurality of automatic warehouses, and a control device that controls the operation of each of the plurality of automatic warehouses, the retrieval transport device, and the inter-warehouse transport device.
  • the control device executes retrieval control to, in response to a transport request in which a type and an order of each of a plurality of articles that are transported to the transport target location are specified, retrieve all the articles specified in the transport request from a target automatic warehouse, which is one automatic warehouse selected from among the plurality of automatic warehouses, to the retrieval transport device in a specified order that is specified in the transport request.
  • the control device executes, before execution of the retrieval control, inter-warehouse movement control to, if at least one of the plurality of articles specified in the transport request is not stored in the target automatic warehouse, move the article that is not stored in the target automatic warehouse from another automatic warehouse to the target automatic warehouse by using the inter-warehouse transport device.
  • the inter-warehouse movement control is executed before execution of the retrieval control, and, thereby, all the articles specified in the transport request can be retrieved from the target automatic warehouse to the retrieval transport device in the retrieval control. Accordingly, it is possible to prevent a situation where, even though an article can be retrieved from an automatic warehouse to the retrieval transport device, it is necessary to wait until an earlier article in the specified order is retrieved from another automatic warehouse. This makes it possible to improve the efficiency of retrieval from the automatic warehouses.
  • the retrieval control all the articles specified in a transport request are retrieved from the target automatic warehouse to the retrieval transport device in the specified order that is specified in the transport request.
  • An article transport method is an article transport method for transporting articles in an article transport facility, the article transport facility including a plurality of automatic warehouses that store articles, a retrieval transport device that transports, to a transport target location, the articles retrieved from the plurality of automatic warehouses, and an inter-warehouse transport device that transports the articles between the plurality of automatic warehouses.
  • the article transport method includes a retrieval step of, in response to a transport request in which a type and an order of each of a plurality of articles that are transported to the transport target location are specified, retrieving all the articles specified in the transport request from a target automatic warehouse, which is one automatic warehouse selected from among the plurality of automatic warehouses, to the retrieval transport device in a specified order that is specified in the transport request; and, before execution of the retrieval step, an inter-warehouse movement step of, if at least one of the plurality of articles specified in the transport request is not stored in the target automatic warehouse, moving the article that is not stored in the target automatic warehouse from another automatic warehouse to the target automatic warehouse by using the inter-warehouse transport device.
  • the inter-warehouse movement step is executed before execution of the retrieval step, and, thereby, all the articles specified in the transport request can be retrieved from the target automatic warehouse to the retrieval transport device in the retrieval step. Accordingly, it is possible to prevent a situation where, even though an article can be retrieved from an automatic warehouse to the retrieval transport device, it is necessary to wait until an earlier article in the specified order is retrieved from another automatic warehouse. This makes it possible to improve the efficiency of retrieval from the automatic warehouses.
  • the retrieval step all the articles specified in a transport request are retrieved from the target automatic warehouse to the retrieval transport device in the specified order that is specified in the transport request.
  • an article transport facility 1 includes a plurality of automatic warehouses 2, a retrieval transport device 4, an inter-warehouse transport device 5, and a control device 6. Note that the transport direction of articles W is indicated by arrows in FIG. 1 and FIG. 3 , which will be referred to below.
  • Each of the plurality of automatic warehouses 2 stores articles W (see FIGS. 3 and 4 ).
  • Each automatic warehouse 2 is configured to store a plurality of articles W and to automatically transport out an article W that is to be retrieved.
  • the automatic warehouse 2 includes a plurality of levels of storage racks that store the articles W, and a transport device that transports out the articles W stored in the storage racks from the storage racks.
  • the transport device includes, for example, transport carriages provided respectively corresponding to the storage racks, or a stacker crane.
  • each of the automatic warehouses 2 is configured to be capable of transporting out the articles W in that warehouse in any order. In other words, the automatic warehouse 2 is configured to be capable of retrieving articles W in an order different from the order in which a plurality of articles W are stored into that warehouse.
  • each automatic warehouse 2 includes a retrieval portion 30, and the above-described transport device included in the automatic warehouse 2 is configured to transport, to the retrieval portion 30, articles W to be retrieved from the storage racks.
  • the retrieval portion 30 is provided with a conveyor (retrieval conveyor) that transports the articles W, and the articles W are transported out (i.e., delivered, or taken out) from the retrieval portion 30 to the retrieval transport device 4 by operating the conveyor.
  • FIG 3 illustrates, by example, a situation where three articles W are disposed (accumulated) in each retrieval portion 30, and the retrieval portion 30 is configured such that a plurality of articles W can be disposed (accumulated), and the articles W are sequentially transported out to the retrieval transport device 4, starting from the article W located on the downstream side (the side toward the retrieval transport device 4).
  • each automatic warehouse 2 includes a storage portion 31, and the above-described transport device included in the automatic warehouse 2 is configured to transport articles W to be stored, from the storage portion 31 to the storage racks. Articles to replenish the automatic warehouse 2 are transported into the storage portion 31 from the outside of the automatic warehouse 2.
  • a storage transport device (not shown).
  • the retrieval transport device 4 is a device that transports, to the transport target location 3, the articles W retrieved from the plurality of automatic warehouses 2.
  • the retrieval transport device 4 transports the articles W retrieved from the automatic warehouses 2 (here, the articles W transported out from the retrieval portions 30) in one direction (a direction toward the transport target location 3) along a transport path connecting the automatic warehouses 2 and the transport target location 3.
  • the retrieval transport device 4 transports the plurality of articles W to the downstream side (the side toward the transport target location 3) in a state in which the order of the plurality of articles W arranged in the transport direction is maintained. That is, the retrieval transport device 4 does not have the function of changing the transport order of the articles W (the function of rearranging the articles W).
  • the retrieval transport device 4 is formed, for example, using a conveyor such as a belt conveyor or a roller conveyor.
  • the respective retrieval portions 30 of the plurality of automatic warehouses 2 are disposed so as to be arranged in the transport direction of the retrieval transport device 4 at intervals.
  • the article transport facility 1 includes four automatic warehouses 2, namely, a first automatic warehouse 21, a second automatic warehouse 22, a third automatic warehouse 23, and a fourth automatic warehouse 24.
  • the retrieval portion 30 of the fourth automatic warehouse 24, the retrieval portion 30 of the third automatic warehouse 23, the retrieval portion 30 of the second automatic warehouse 22, and the retrieval portion 30 of the first automatic warehouse 21 are disposed in that order from the upstream side in the transport direction of the retrieval transport device 4 (the side opposite to the side toward the transport target location 3).
  • a plurality of transport target locations 3 are provided in the present embodiment. Accordingly, the transport path of the retrieval transport device 4 branches off into a plurality (specifically, the number of transport target locations 3 installed) of branch paths on the downstream side, and each of the branch paths extends to the corresponding transport target location 3.
  • the retrieval transport device 4 is controlled so as to transport articles W retrieved from each of the automatic warehouses 2 to a transport target location 3 that is set as the transport destination of the articles W.
  • the transport target location 3 processing (operation) using a robot, an operator, or the like is performed on articles W that are retrieved from the automatic warehouses 2 and are transported by the retrieval transport device 4. That is, the transport target location 3 is a processing station (operating station). Examples of the processing performed at the transport target location 3 include picking processing, packaging processing, assorting processing, and palletizing processing.
  • the articles W are containers (cardboard box cases, container cases, etc.) that house a load to be picked, and the required number (the required number corresponding to the shipment destination) of loads are removed from each of the articles W in the picking processing. In this case, one or more (basically, a plurality of) loads of the same type are housed in one article W.
  • each article W is directly loaded, or the loads removed from the article W are loaded, to a roll box pallet, a cart, a pallet, or the like corresponding to the shipment destination.
  • All the articles W specified in a transport request are transported to the transport target location 3 by the retrieval transport device 4 in a specified order that is specified in the transport request. Also, at the transport target location 3, the processing on the articles W is performed in order from the earliest arrival at the transport target location 3 (i.e., in the specified order). Since the properties (weight, dimensions, shape, etc.) of an article W (or the load housed in the article W) may differ for each article W, the specified order is set so as to enable the processing on the articles W at the transport target location 3 to be performed appropriately.
  • the article transport facility 1 is configured to transport the articles W retrieved from the automatic warehouses 2 to the transport target location 3 in the specified order.
  • the inter-warehouse transport device 5 is a device that transports the articles W between the plurality of automatic warehouses 2.
  • the inter-warehouse transport device 5 is used to collect all the articles W specified in a transport request into one automatic warehouse 2 in inter-warehouse movement control, which will be described below.
  • the inter-warehouse transport device 5 is formed using a conveyor such as a belt conveyor or a roller conveyor, for example.
  • FIG. 1 illustrates, by example, a case where the inter-warehouse transport device 5 is disposed on the side opposite to the side on which the retrieval transport device 4 is disposed relative to the automatic warehouses 2, the placement position of the inter-warehouse transport device 5 is not limited thereto.
  • the inter-warehouse transport device 5 is disposed on the same side as the side on which the retrieval transport device 4 is disposed relative to the automatic warehouses 2.
  • FIG. 1 illustrates, by example, a case where the inter-warehouse transport device 5 is configured to transport the articles W between a plurality of automatic warehouses 2 without the intervention of the retrieval transport device 4, the inter-warehouse transport device 5 can be constructed using a portion of the configuration of the retrieval transport device 4. In this case, the transport path of the inter-warehouse transport device 5 is formed so as to branch off from the retrieval transport device 4 to be connected to the automatic warehouses 2.
  • a control device 6 included in the article transport facility 1 controls the operation of each of the plurality of automatic warehouses 2, the retrieval transport device 4, and the inter-warehouse transport device 5.
  • the control device 6 includes an arithmetic processing device such as a CPU, and also includes a peripheral circuit such as a memory.
  • Various functions of the control device 6 are realized through cooperation between these pieces of hardware and programs executed on hardware such as the arithmetic processing device.
  • the control device 6 executes retrieval control and inter-warehouse movement control. That is, an article transport method for transporting the articles W in the article transport facility 1 includes a retrieval step and an inter-warehouse movement step.
  • the retrieval control is a control (step) to, in response to a transport request in which the type and the order of each of a plurality of articles W that are transported to the transport target location 3 are specified, retrieve all the articles W specified in the transport request from a target automatic warehouse, which is one automatic warehouse 2 selected from a plurality of automatic warehouses 2, to the retrieval transport device 4 in the specified order that is specified in the transport request.
  • the inter-warehouse movement control is a control (step) to, if at least one of the plurality of articles W specified in the transport request is not stored in the target automatic warehouse, move the article W that is not stored in the target automatic warehouse from another automatic warehouse 2 to the target automatic warehouse by using the inter-warehouse transport device 5.
  • the control device 6 executes the inter-warehouse movement control (inter-warehouse movement step) before execution of the retrieval control (retrieval step). Note that the control device 6 manages data regarding the position at which each of the articles W is stored, and executes the retrieval control and the inter-warehouse movement control by referring to the data.
  • the transport request is generated in response to a request from a request source such as a shipment destination of each article W (or the loads housed in the article W).
  • the transport request is generated by the control device 6, or by another device capable of communicating with the control device 6.
  • the order of the plurality of articles W that are transported to the transport target location 3 is determined with consideration given to the properties of each of the plurality of articles W (or the loads housed in the articles W).
  • a plurality of articles W of the same type may be included in a plurality of articles W that are specified in the transport request.
  • specifying the type of each of the plurality of articles W that are transported to the transport target location 3 means the same as specifying the type of each of the articles W that are transported to the transport target location 3, and the number of articles W for each type.
  • picking processing in which a load housed in a container serving as an article W is removed from the container is performed at the transport target location 3, the articles W in which loads of the same type are housed are handled as the articles W of the same type regardless of the number of loads housed therein.
  • a request from a request source specifies the types of loads and the number of loads for each type.
  • a transport request that is generated based on such a request from the request source specifies the types of articles W that house the loads of the specified types, and the number of articles W for each type.
  • the number of articles W for each type is set to the smallest number with which the total number of loads housed is greater than or equal to the specified number of loads of that type.
  • a request from the request source specifies the types of articles W and the number of articles W for each type, and a transport request that is generated based on such a request from the request source is the same as the request from the request source.
  • FIG. 3 shows a situation where the first automatic warehouse 21, the second automatic warehouse 22, the third automatic warehouse 23, and the fourth automatic warehouse 24 are selected as target automatic warehouses for transport requests that are different from each other. Specifically, FIG.
  • the first automatic warehouse 21 is selected as the target automatic warehouse for a transport request to transport three articles W, namely, an article (A-1), an article (A-2), and an article (A-3) to the transport target location 3 in the order of the article (A-1), the article (A-2), and the article (A-3)
  • the second automatic warehouse 22 is selected as the target automatic warehouse for a transport request to transport three articles W, namely, an article (B-1), an article (B-2), and an article (B-3), to the transport target location 3 in the order of the article (B-1), the article (B-2), and the article (B-3)
  • the third automatic warehouse 23 is selected as the target automatic warehouse for a transport request to transporting three articles W, namely, an article (C-1), an article (C-2), and an article (C-3) to the transport target location 3 in the order of the article (C-1), the article (C-2), and the article (C-3)
  • the fourth automatic warehouse 24 is selected as the target automatic warehouse for a transport request to transport three articles W, namely
  • FIG. 3 shows a situation where, as a result of execution of inter-warehouse movement control (details thereof will be described below) shown in FIG. 4 , all the articles W (here, three articles W) specified in the transport request have been collected in each of the first automatic warehouse 21, the second automatic warehouse 22, the third automatic warehouse 23, and the fourth automatic warehouse 24.
  • a situation is shown where all the articles W specified in the transport request are disposed in the retrieval portion 30 of each of the target automatic warehouses such that they are arranged from the downstream side in the specified order that is specified in the transport request.
  • the three articles W namely, the article (A-1), the article (A-2), and the article (A-3), can be retrieved to the retrieval transport device 4 in the order of the article (A-1), the article (A-2), and the article (A-3). That is, all the articles W specified in the transport request can be retrieved from the target automatic warehouse (here, the first automatic warehouse 21) to the retrieval transport device 4 in the specified order that is specified in the transport request.
  • the retrieval control is executed, provided that the target automatic warehouse has entered a state (hereinafter referred to as "retrievable state") in which all the articles W specified in the transport request can be retrieved.
  • the retrievable state can be, for example, a state in which all the articles W specified in the transport request are present in the target automatic warehouse, a state in which all the articles W specified in the transport request are present in the target automatic warehouse, and the first article W in the specified order has arrived at the retrieval portion 30, or a state in which all the articles W specified in the transport request have arrived at the retrieval portion 30 of the target automatic warehouse.
  • the retrieval control may be started before the inter-warehouse movement control ends.
  • the inter-warehouse movement control is executed before execution of the retrieval control (i.e., the inter-warehouse movement control is started before the retrieval control is started).
  • the retrieval control is executed in order from the target automatic warehouse that has entered the retrievable state earlier, a plurality of target automatic warehouses may enter the retrievable state at the same time as in the case shown in FIG. 3 .
  • a priority level is set for each transport request, it is possible to adopt a configuration in which the retrieval control is executed in order from the highest priority of the transport request.
  • a plurality of retrieval controls corresponding to a plurality of transport requests can be executed at the same time.
  • an article W specified in another transport request may be disposed between two articles W specified in one transport request.
  • the articles W retrieved from each of the target automatic warehouses can be transported to the corresponding transport target location 3 in the specified order.
  • control device 6 is configured to determine the transport target location 3 that serves as the transport destination of a group of articles W retrieved from the target automatic warehouse by the retrieval control, according to the state of progress of processing on the articles W at each of the transport target locations 3 at the point in time when the first article W in the specified order is retrieved from the automatic warehouse 2 to the retrieval transport device 4 (here, at the point in time when the aforementioned article W is transported out from the retrieval portion 30 to the retrieval transport device 4).
  • the control device 6 is configured to determine the transport target location 3 in the following manner.
  • control device 6 selects that transport target location 3 as the transport destination of a group of articles W retrieved from the target automatic warehouse by the retrieval control.
  • the control device 6 selects the transport target location 3 for which the state of progress of processing (a series of processing corresponding to one transport request) is most advanced (i.e., the transport target location 3 for which processing is expected to end earliest) from among the plurality of transport target locations 3, as the transport destination of a group of articles W retrieved from the target automatic warehouse by the retrieval control. If there are a plurality of transport target locations 3 that satisfy the same condition, the selection among the transport target locations 3 may be performed based on a condition other than the state of progress of processing. For example, the selection may be performed based on the transport distance from the target automatic warehouse to each of the transport target locations 3, or the processing capability or the like at each of the transport target locations 3.
  • FIG. 4 assumes the same situation as that shown in FIG. 3 .
  • each article W is indicated by a solid line in a frame indicating the automatic warehouse 2 in which the article W is stored before execution of the inter-warehouse movement control.
  • each article W after execution of the inter-warehouse movement control is indicated by a broken line in a frame indicating the automatic warehouse 2 to which the article W is moved.
  • the control device 6 is configured to determine the target automatic warehouse such that the number of times that the articles W are moved between different automatic warehouses 2 by the inter-warehouse movement control (hereinafter simply referred to as "number of times of movement") is smallest. If there is any automatic warehouse 2 in which all the articles W specified in the transport request are stored (i.e., if there is any automatic warehouse 2 for which the number of times of movement is zero), that automatic warehouse 2 is determined as the target automatic warehouse.
  • the control device 6 selects one automatic warehouse 2 as the target automatic warehouse in response to a transport request
  • the control device 6 manages the automatic warehouse 2 as an automatic warehouse 2 that is being selected as the target automatic warehouse, at least until the retrieval control in response to the transport request is started (e.g., until the retrieval control ends). Then, at a point in time after the retrieval control in response to the transport request has been started (e.g., at the point in time when the retrieval control ends), the control device 6 manages the automatic warehouse 2 as an automatic warehouse 2 that is not being selected as the target automatic warehouse.
  • the control device 6 When the control device 6 has selected the automatic warehouse 2 being selected as the target automatic warehouse as the target automatic warehouse in response to another transport request, the control device 6 manages the other transport request as an unprocessed transport request, and executes the retrieval control in response to the transport request in order from the earliest time of selection of the target automatic warehouse. Then, at a point in time after the retrieval control in response to the last transport request has been started (e.g., at the point in time when the retrieval control ends), the control device 6 manages the automatic warehouse 2 as an automatic warehouse 2 that is not being selected as the target automatic warehouse.
  • the selection of the target automatic warehouse will be specifically described with reference to FIG. 4 .
  • the number of times of movement is once when the first automatic warehouse 21 is selected as the target automatic warehouse
  • the number of times of movement is twice when the second automatic warehouse 22 is selected as the target automatic warehouse
  • the number of times of movement is three times when the third automatic warehouse 23 or the fourth automatic warehouse 24 is selected as the target automatic warehouse.
  • the first automatic warehouse 21 is selected as the target automatic warehouse, and the inter-warehouse movement control is executed so as to move the article (A-3) to the first automatic warehouse 21.
  • the second automatic warehouse 22 is selected as the target automatic warehouse, and the inter-warehouse movement control is executed so as to move the article (B-2) to the second automatic warehouse 22.
  • the number of times of movement is smallest, namely, twice, when one of the first automatic warehouse 21, the third automatic warehouse 23, and the fourth automatic warehouse 24 is selected as the target automatic warehouse; however, among the three automatic warehouses 2, the first automatic warehouse 21 is being selected as the target automatic warehouse for another transport request, and the third automatic warehouse 23 and the fourth automatic warehouse 24 are not being selected as the target automatic warehouse for another transport request.
  • the efficiency of processing transport requests can be improved by selecting that automatic warehouse 2 as the target automatic warehouse.
  • the third automatic warehouse 23 or the fourth automatic warehouse 24 (here, the third automatic warehouse 23) is selected as the target automatic warehouse, and the inter-warehouse movement control is executed so as to move the article (C-1) and the article (C-2) to the third automatic warehouse 23.
  • the automatic warehouse 2 for which the number of times of movement is smallest may be selected as the target automatic warehouse, from among the plurality of automatic warehouses 2, for example.
  • the number of times of movement is smallest, namely, twice, when one of the first automatic warehouse 21, the second automatic warehouse 22, and the third automatic warehouse 23 is selected as the target automatic warehouse, whereas the number of times of movement is more than twice, namely, three times, when the fourth automatic warehouse 24 is selected as the target automatic warehouse. Accordingly, to make the number of times of movement smallest, one of the first automatic warehouse 21, the second automatic warehouse 22, and the third automatic warehouse 23 may be selected as the target automatic warehouse.
  • the first automatic warehouse 21, the second automatic warehouse 22, and the third automatic warehouse 23 are being selected as the target automatic warehouse for another transport request, and the fourth automatic warehouse 24 is not being selected as the target automatic warehouse for another transport request.
  • the fourth automatic warehouse 24 is selected as the target automatic warehouse, and the inter-warehouse movement control is executed so as to move the article (D-1), the article (D-2), and the article (D-3) to the fourth automatic warehouse 24.
  • control device 6 is configured to, if there is any automatic warehouse 2 that is not being selected as the target automatic warehouse for another transport request, preferentially select that automatic warehouse 2 as the target automatic warehouse.
  • control device 6 is configured to, if there are a plurality of automatic warehouses 2 for which the number of times of movement is smallest, and if the plurality of automatic warehouses 2 include any automatic warehouse 2 (unselected automatic warehouse) that is not being selected as the target automatic warehouse for another transport request, select that automatic warehouse 2 (that unselected automatic warehouse) as the target automatic warehouse.
  • control device 6 is configured to, if all of one or more automatic warehouses 2 for which the number of times of movement is smallest are being selected as the target automatic warehouse for another transport request, and if there is any automatic warehouse 2 (unselected automatic warehouse) for which the number of times of movement is not smallest, but that is not being selected as the target automatic warehouse for another transport request, select that automatic warehouse 2 (that unselected automatic warehouse) as the target automatic warehouse.
  • the automatic warehouse 2 for which the number of times of movement is smallest may be selected, from among these plurality of automatic warehouses 2, as the target automatic warehouse.
  • condition for selecting the target automatic warehouse may include the condition that the number of times of movement is less than or equal to a predetermined set number of times. If the number of times of movement exceeds the set number of times when an automatic warehouse 2 that is not being selected as the target automatic warehouse for another transport request is selected as the target automatic warehouse, an automatic warehouse 2 that is being selected as the target automatic warehouse for another transport request, and for which the number of times of movement is smallest may be selected as the target automatic warehouse.
  • the control device 6 is configured to determine the target automatic warehouse such that the number of times of movement is smallest.
  • the control device 6 selects an automatic warehouse 2 for which the number of unprocessed transport requests is smallest as the target automatic warehouse, or a configuration in which the control device 6 selects an automatic warehouse 2 for which the number of times that the automatic warehouse 2 is selected as the target automatic warehouse within a predetermined period is smallest as the target automatic warehouse.
  • an automatic warehouse 2 for which the number of times of movement is smallest may be selected, from among those plurality of automatic warehouses 2, as the target automatic warehouse.
  • the condition for selecting the target automatic warehouse may include the condition that the number of times of movement is less than or equal to a predetermined set number of times.
  • a free space (free rack) for storing articles W that have been moved from another automatic warehouse 2 needs to be secured for each of the plurality of automatic warehouses 2.
  • the article transport facility 1 may require an increased number of automatic warehouses 2 as compared with a configuration in which the inter-warehouse movement control is not executed.
  • articles W that are stored in the target automatic warehouse do not need to be moved using the inter-warehouse transport device 5. Accordingly, even if the number of automatic warehouses 2 installed is increased, the number of increase can be minimized due to the presence of the articles W that do not need to be moved.
  • the articles W are stored in the automatic warehouses 2 both before and after they are moved. Accordingly, unlike the article rearrangement device of JP 2018 -12 586 A described above, the inter-warehouse transport device 5 does not need to have the function of accumulating a plurality of articles W, and an increase in the cost of the facility and the installation space can be more easily suppressed than in a case where the article rearrangement device is provided.
  • step #01: Yes a transport request occurs (step #01: Yes)
  • step #02 the control device 6 executes the processing of step #02 onward.
  • step #01: Yes the control device 6 selects the target automatic warehouse from among a plurality of automatic warehouses 2 (step #02). Then, if all the articles W that are specified in the transport request are stored in the target automatic warehouse (step #03: Yes), the control device 6 selects the transport target location 3 (step #05), and executes the retrieval control (retrieval step) (step #06).
  • step #03 the control device 6 executes the inter-warehouse movement control (inter-warehouse movement step) (step #04), then selects the transport target location 3 (step #05), and executes the retrieval control (retrieval step) (step #06).
  • inter-warehouse movement step inter-warehouse movement step
  • step #05 selects the transport target location 3
  • step #06 retrieves the retrieval control
  • control device 6 is configured to determine the transport target location 3 that serves as the transport destination of a group of articles W retrieved from the target automatic warehouse by the retrieval control, according to the state of progress of processing on the articles W at each of the transport target locations 3 at the point in time when the first article W in the specified order is retrieved from the automatic warehouse 2 to the retrieval transport device 4.
  • the present invention is not limited to such a configuration, and it is possible to adopt, for example, a configuration in which the control device 6 is configured to determine the transport target location 3 that serves as the transport destination of a group of articles W retrieved from the target automatic warehouse by the retrieval control, according to the state of progress of processing on the articles W at each of the transport target locations 3 at a point in time before the point in time when the first article W in the specified order is retrieved from the automatic warehouse 2 to the retrieval transport device 4.
  • the "point in time before” is, for example, the point in time when the first article W in the specified order has arrived at the retrieval portion 30 of the target automatic warehouse, or the point in time when the first article W in the specified order has been transported out from a storage rack in the target automatic warehouse.
  • the above embodiment has described, as an example, a configuration in which the transport target location 3 that serves as the transport destination of a group of articles W retrieved from the target automatic warehouse by the retrieval control is not limited to a specific transport target location 3.
  • the present invention is not limited to such a configuration, and it is possible to adopt, a for example, a configuration in which automatic warehouses 2 are respectively associated with transport target locations 3 in advance, and the transport target location 3 that serves as the transport destination of a group of articles W retrieved from a target automatic warehouse by the retrieval control is set to the transport target location 3 associated with the target automatic warehouse.
  • one transport target location 3 may be determined based on the state of progress of processing on the articles W at each of the plurality of transport target locations 3, as in the case of the above embodiment.
  • the above embodiment has described, as an example, a configuration in which a plurality of transport target locations 3 are provided.
  • the present invention is not limited to such a configuration, and it is possible to adopt, for example, a configuration in which only one transport target location 3 is provided.
  • An article transport facility includes a plurality of automatic warehouses that store articles, a retrieval transport device that transports, to a transport target location, the articles retrieved from the plurality of automatic warehouses, an inter-warehouse transport device that transports the articles between the plurality of automatic warehouses, and a control device that controls the operation of each of the plurality of automatic warehouses, the retrieval transport device, and the inter-warehouse transport device.
  • the control device executes retrieval control to, in response to a transport request in which a type and an order of each of a plurality of articles that are transported to the transport target location are specified, retrieve all the articles specified in the transport request from a target automatic warehouse, which is one automatic warehouse selected from among the plurality of automatic warehouses, to the retrieval transport device in a specified order that is specified in the transport request.
  • the control device executes, before execution of the retrieval control, inter-warehouse movement control to, if at least one of the plurality of articles specified in the transport request is not stored in the target automatic warehouse, move the article that is not stored in the target automatic warehouse from another automatic warehouse to the target automatic warehouse by using the inter-warehouse transport device.
  • the inter-warehouse movement control is executed before execution of the retrieval control, and, thereby, all the articles specified in the transport request can be retrieved from the target automatic warehouse to the retrieval transport device in the retrieval control. Accordingly, it is possible to prevent a situation where, even though an article can be retrieved from an automatic warehouse to the retrieval transport device, it is necessary to wait until an earlier article in the specified order is retrieved from another automatic warehouse. This makes it possible to improve the efficiency of retrieval from the automatic warehouses.
  • the retrieval control all the articles specified in a transport request are retrieved from the target automatic warehouse to the retrieval transport device in the specified order that is specified in the transport request.
  • the control device determines the transport target location that serves as a transport destination of a group of articles retrieved from the target automatic warehouse by the retrieval control, according to a state of progress of processing on the articles at each of the transport target locations at a point in time when the first article in the specified order is retrieved from the automatic warehouse to the retrieval transport device.
  • the transport target location that serves as the transport destination can be determined at the timing at which the retrieval control is started, despite the fact that the time required for a target automatic warehouse to enter a state (hereinafter referred to as "retrievable state") in which all the articles specified in the transport request can be retrieved may vary depending on the storage position of each of the articles in the target automatic warehouse or the operating state of the target automatic warehouse. Since the transport target location that serves as the transport destination is determined according to the state of progress of processing on the articles at each of the transport target locations, a transport target location for which the processing can be expected to be executed early, for example, a transport target location for which the previous processing has already ended, can be determined as the transport destination. Accordingly, with the above-described configuration, it is possible to efficiently execute the processing at each of the transport target locations, while minimizing the influence exerted by the fact that the time required for the target automatic warehouse to enter the retrievable state varies as described above.
  • control device determines the target automatic warehouse such that the number of times that the article is moved between different automatic warehouses by the inter-warehouse movement control is smallest.
  • the time required for the target automatic warehouse to enter the retrievable state from occurrence of a transport request can be kept short, and the retrieval control in response to the transport request can be executed earlier. Furthermore, the amount of articles transported by the inter-warehouse transport device can be kept small, and it is therefore possible to easily simplify the configuration of the inter-warehouse transport device and to reduce the size thereof.
  • control device preferentially selects the automatic warehouse as the target automatic warehouse.
  • An article transport method for transporting articles in an article transport facility including a plurality of automatic warehouses that store articles, a retrieval transport device that transports, to a transport target location, the articles retrieved from the plurality of automatic warehouses, and an inter-warehouse transport device that transports the articles between the plurality of automatic warehouses.
  • the article transport method includes a retrieval step of, in response to a transport request in which a type and an order of each of a plurality of articles that are transported to the transport target location are specified, retrieving all the articles specified in the transport request from a target automatic warehouse, which is one automatic warehouse selected from among the plurality of automatic warehouses, to the retrieval transport device in a specified order that is specified in the transport request; and, before execution of the retrieval step, an inter-warehouse movement step of, if at least one of the plurality of articles specified in the transport request is not stored in the target automatic warehouse, moving the article that is not stored in the target automatic warehouse from another automatic warehouse to the target automatic warehouse by using the inter-warehouse transport device.
  • the inter-warehouse movement step is executed before execution of the retrieval step, and, thereby, all the articles specified in the transport request can be retrieved from the target automatic warehouse to the retrieval transport device in the retrieval step. Accordingly, it is possible to prevent a situation where, even though an article can be retrieved from an automatic warehouse to the retrieval transport device, it is necessary to wait until an earlier article in the specified order is retrieved from another automatic warehouse. This makes it possible to improve the efficiency of retrieval from the automatic warehouses.
  • the retrieval step all the articles specified in a transport request are retrieved from the target automatic warehouse to the retrieval transport device in the specified order that is specified in the transport request.
  • the article transport facility according to the present invention can achieve at least one of the above-described effects.
  • Various additional features illustrated as preferred embodiments of the article transport facility can be incorporated into the article transport method according to the present invention, in which case, the article transport method can achieve the operations and effects corresponding to the respective additional features.

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US11383929B2 (en) 2022-07-12
US20200010274A1 (en) 2020-01-09

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